<template>
  <div class="login-container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="" />
      </div>
      <!-- 登陆表单区域 -->
      <el-form
        ref="loginFormRef"
        :model="loginForm"
        :rules="loginFormRules"
        label-width="0px"
        class="login_form"
      >
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input
            v-model="loginForm.username"
            prefix-icon="iconfont icon-user"
          ></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input
            type="password"
            v-model="loginForm.password"
            prefix-icon="iconfont icon-3702mima"
          ></el-input>
        </el-form-item>
        <!-- 按钮 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="checkLogin">登陆</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //这里是登陆表单的数据绑定对象
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      //这是表单的验证规则对象
      loginFormRules: {
        //验证用户名是否合法
        username: [
          { required: true, message: '请输入用户名称!', trigger: 'blur' },
          {
            min: 3,
            max: 10,
            message: '用户名长度在 3 到 10 个字符!',
            trigger: 'blur'
          }
        ],
        //验证面是否合法
        password: [
          { required: true, message: '请输入密码!', trigger: 'blur' },
          {
            min: 6,
            max: 15,
            message: '密码长度在 6 到 15 个字符!',
            trigger: 'blur'
          }
        ]
      }
    }
  },
  methods: {
    //点击重置登陆表单
    resetLoginForm() {
      // console.log(this);
      //调用resetFields重置表单
      this.$refs.loginFormRef.resetFields()
    },
    //表单预校验
    checkLogin() {
      //调用validate进行预校验,参数是一个回到函数，返回一个布尔值，校验成功为true
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return //校验不通过，阻止程序往下执行
        var result = await this.$http.post('login', this.loginForm)
        // alert(result.meta.msg);
        if (result.meta.status !== 200) return this.$message.error('登陆失败')
        this.$message.success('登陆成功')
        //1.登陆成功之后的token，保存到客户端的sessionStorage中
        // 1.1项目中除了登陆之外的其他API接口，必须在登陆之后才能访问
        // 1.2token只应在当前网站打开期间生效，所以将token保存在sessionStorage中
        // console.log(result)
        window.sessionStorage.setItem('token', result.data.token)
        //2.通过编程时导航跳转到后台页面，路由地址是/home
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="less" scoped>
.login-container {
  background-color: #2b4b6b;
  height: 100%;
  .login_box {
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    .avatar_box {
      width: 130px;
      height: 130px;
      border: 1px solid #eee;
      border-radius: 50%;
      padding: 10px;
      box-shadow: 0 0 10px #ddd;
      position: absolute;
      left: 50%;
      transform: translate(-50%, -50%);
      background-color: #fff;
      img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
      }
    }
    .btns {
      display: flex;
      justify-content: flex-end;
    }
    .login_form {
      position: absolute;
      bottom: 0;
      width: 100%;
      padding: 0 20px;
      box-sizing: border-box;
    }
  }
}
</style>
